Telegraph system



June 4, 1935. F, WATSON 2,003,325

TELEGRAPH SYSTEM Original Filed Jan. 4, 1935 2 Sheet s$heet 1 FIG. 2

F/GJ rifilb 5a 1 "f vvvv 1 T2 M H111! flifl E L INVENTOR EJ-TWATSON ATTORNEY June 4, 1935. E. F. WATSON 2,003,325

TELEGRAPH SYSTEM Original Filed Jan. 4, 1933 2 Sheets-Sheet 2' FIG. 3

- )NVENTOR By E. E WATSON ATTQRNEV Patented June 4, 1935 OFFICE 2.00am TELEGRAPH srs'rsu Edward F. Watson, Larchmont, N. r.. assignor to American Telephone and Telegraph Company, a corporation New York Application January 4, 1933, Serial No. 650.197 Renewed August 4, 1934 BClalms.

This invention relates to telegraph systems and more particularly to printing telegraph systems.

Printing telegraph stations are usuall provided with a transmitting mechanism connected in series with a receiving printing mechanism. With this arrangement the printing mechanism at the transmitting station prints a copy of the message as it is transmitted. This, however, is no indication to the transmitting operator that the messages have been correctly received by the receiving printing mechanism at the receiving station.

The object of this invention is to provide a telegraph system which enables the transmitting operator to check the accuracy with which the receiving mechanism at the receiving station receives the message. Such a system is very desirable when coded messages are to be transmitted or when it is desirable to send messages to an unattended printer station. Briefly the invention provides a two-way telegraphic communication channel between two stations so that the signals from the sending station may be transmitted to the receiving station where the printing mechanism is so arranged as to cause the repetition of the signals back to the printing mechanism at the sending station. In this way the record of the message at the sending station will be produced as a result of the operation of the receiving printing mechanism at the receiving station and will indicate to the sending operator what has been recorded at the receiving station.

A feature of the invention is the mechanism loprints and repeats the message back to the sending station which comprises a receiving printer mechanism having permutation elements for selecting the characters to be printed and a transmitting distributor mechanically connected to these elements for repeatingthe signals as recorded by these elements back to the transmitting station.

A specific embodiment of the invention may be easily and completely understood from the following description when read with reference to the attached drawings of which:

Figure 1 shows a schematic drawing of the electrical circuit.

Fig. 2 shows a front view of the apparatus located at the receiving station.

- Fig. 3 shows a top sectional view of Fig. 2 in which features of the transmitting cam clutch release mechanism are illustrated; and

Fig. 4 shows a detail of the mechanical linkages cated at the receiving station which receives,-

and connections between the receiving mechanism and the transmitter. I

Referring to Fig. 1, the transmitting station A comprises a transmitter, the transmitting contacts of which are illustrated at so and are connected 5 to a telegraph channel Tl which extends from the transmitting station A to the receiving station B. The receiving magnet rb of the receiving printer mechanism at station 3 is also connected to channel T1, so that the signals transmitted by 10 the transmitting contacts so at the transmitting station A will be received and recorded at station E. Associated with the receiving mechanism at station B is a transmitter the contacts of which are illustrated at sb. These contacts are con- 15 trolled by the receiving mechanism so that they will retransmit the signals as received by the receiving apparaus of station B, back over the telegraph channel T2 to the transmitting station A to be recorded thereat by the receiving print- 20 ing mechanism controlled by magnet ra. Thus a record of the message as received by the re-v ceiving printer at B is printed at the sending station A. Obviously a two-way full duplex channel between the stations could replace the two oneway channels T1 and T2 illustrated. I

Details or the receiving, printingand repeating mechanisms located at station B are illustrated in Figs. 2, 3 and 4. Only those portions of this apparatus are shown and described that are 30 necessary for a complete understanding of this embodiment of the invention. The complete operation of the receiving printer is described in a patent application Morton et al., Serial No. 467,- 352, filed July 11, 1930, Patent No. 1,904,164, granted April 18, 1933.

Referring now to these figures, the selector vanes 35, 31, 38, 39 and 40 extend across the front of the printer and are adapted to be rotated either clockwise or counter-clockwise about pivo ots 43 (Fig. 3) mounted in support II by the receiving magnet and associated mechanism (not illustrated) in accordance with the received signals. Cooperating with these vanes 36 to 40 are bell crank levers u to 48 which slide the code 45 bars on pins BI and 62 in accordance with the positions of the selector vanes.

These code bars, as is well known, are thus adapted to beset in difierent combinations in accordance with the different received code sig- 5Q nal combinations and are so notched on their up-. per edges that in any setting the notches are aligned so that one of the pull bars 63 can fall into the aligned notches under the influence of a spring individual thereto (not illustrated). The 55 pull bar thus selected then engages the pull bar bail (not illustrated) and causes an associated typebar 61 to strike the printing surface supported by platen 4 through the inking ribbon as in ordinary typewriters.

pulses. Fig. 4 illustrates the details of two sets of these links connecting extensions 39' and 40' to the sending latches 664 through links 36., 36s and 36, and 60., 40s, and 40s, respectively. These sending latches I are adapted to be thus recip- V rocated in accordance with the received signal and control the transmitting contact levers 663. A series of transmitting cams 662 actuate the contact levers 663 in succession so that the contacts 606 transmit the signals as received by the receiving mechanism. A locking loop "I is proided to lock the sending latches 666 in the position set by the received signal until the complete signal has been re-transmitted. This locking loop "I is actuated by cam 660 and engages projections 666 of the sending latches as soon as the transmitting earns 66! start to rotate. Thus, the sending latches are locked in the position set by the selector vanes 36 to 40 until loop 6" releases them after the complete signal combination has been transmitted. It should be noted that looking these sending latches in this manner does not interfere with the operation of theprinting mechanism or with the receipt of the pulses of the next signal combination since a complete overlap feature is provided in the receiving mechanism associated with the receiving magnet (not illustrated) The transmitting cams 662 are driven through clutch members 606 and 6 ID from shaft 511 which is driven by motor 12 through suitable gears. The

' clutch member H0 is provided with the stop cam 6|! which cooperates with the clutch lever 606 pivoted at 601 so as to disengage the clutch members M0 and 606 and hold the cams 682 and clutch member 610 normally at rest. The driven member 666 of the driving clutch which controls the mechanical operation of the printing apparatus is also normally held at rest. Member 566 is provided with a flange 666 which is in turn provided with a cam surface 56! adapted to cooperate with arms 566 of the clutch throw-out lever 669. Lever 669 is pivoted at 6'" and 612 and is provided with an arm 513 adapted to cooperate with cam 63' of the cam barrel 82 to eflect the release of the clutch member 665, which when thus released will move to the left into mesh or engagement with member 96 due to the action of spring 514 and actuate the mechanical operations of the printing apparatus.

The cam drum 02 is released by the receiving magnet and carries selecting cams (not shown) which effect the selection of the selector vanes 36 to 40. Cam 63' is provided which actuates arms 513 of the clutch throw-out lever 569 and is so located with respect to the other cams that it will cam out member 669 after the selector vanes 36 to 40 have been selectively arranged so that the character so selected will then be printed;

The release of member 666 and its subsequent movement to the left by spring 614 will allow rod 604 to also move to the left in support 602 and 606. This will allow clutch levers 606 to rotate counter-clockwise under tne'action 91 spring 608. This releases clutch member 610 which will then engage driving clutch member 608 and be driven thereby. This will rotate cams 662 and thus re-transmit the signals as received by the receiving mechanism and stored on the permutation elements or selector vanes 36 to 40 to the receiving printer located at the sending station. A roller 60l is provided on the end of rod 604 which engages the clutch element 666 to reduce the friction of this rod on the clutch when the clutch is rotating.

The above description of one specific embodiment of the invention is not to limit'or restrict the scope of the invention as defined in the appended claims since there may be other embodiments and modifications without departing from the essentials of the invention.

What is claimed is:

1. A telegraph. system comprising a transmitter for transmitting permutation telegraph signals, a conductive transmission line connected thereto, a receiving printing mechanism connected to said conductive transmission line, a group of selector vanes controlling said printing mechanism in accordance with the received telegraph signals, a second transmitter mechanism associated with said receiving printer, meansfor connecting said second transmitter to said group of selector vanes in said printer mechanism, a second conductive transmission line connected to said second transmitter and a second receiving printer connected to said second conductive transmission line. said second receiving printer being located near said first transmitter.

2. The combination of a printing telegraph receiving mechanism connected to an incoming conductive telegraph line and a telegraph signal transmitting device connected to an outgoing conductive telegraph line wherein a plurality of selector vanes are provided to control said receiving mechanism and mechanical means are connected between said selector vanes and said transmitting device to control the signals transmitted thereby in accordance with the position of said selector vanes.

3. A regenerative printing telegraph repeater comprising a receiving mechanism, a group of permutation elements controlled thereby, a plurality of cam operated transmitting contacts mechanically controlled by said permutation elements and a printing mechanism controlled by said elements.

4. A telegraph repeater comprising an incoming conductive line, a receiving element connected to said incoming line for receiving telegraph impulses, a plurality of selector elements cooperating therewith for storing the received signal impulses, an outgoing conductive line, a telegraph transmitter connected to said outgoing line, means for controlling said transmitter in accordance with the impulses stored by said selector elements, whereby said transmitter will retransmit the signals as received by said receiving element,,and a printing mechanism associated with said selector elements for recording the signals transmitted through said repeater.

5. Atelegraph device comprising a receiving mechanism for receiving permutation groups of electrical impulses representing a symbol, a group of selector elements, means for actuating said selector elements in accordance with said received impulses, means controlled by said selector elements for printing the symbols represented by said impulses, and a group of cam operated contacts controlled by said selector elements for regenerating and retransmitting these permutation groups of impulses.

6. A printing telegraph device comprising a receiving mechanism for receiving permutation code groups of telegraph signal impulses, a group of selecting members controlled by said receiving mechanism, a. printing mechanism controlled by said selecting members, a signal retransmitting device also controlled by said selecting members and a group of storing members connecting said selecting members to said receiving device whereby said receiving device may receive a permutation code group of telegraph signal impulses while said printing mechanism is printing the symbol represented by the preceding group of impulses and the retransmitting device retransmitting said preceding group of impulses.

EDWARD F. WATSON. 

